Thomas i



T. I. DUFFY.

LAMP. APPLICATION FILED JAN. 15,19l7.

- Patented June 3, 1919.

lamps the reflector and lamp socket.

onrran STATES. PATENT orrioa.

THOMAS Il DUFFY, OF CHICAGO, ILLINOIS, ASSIGNOR TO STEWART-WARNER SPEEDOMETER CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF VIRGINIA.

To all whom it may concern:

Be it known that I, THOMAS I. DUFFY, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain Improve ments in Lamps; and I do hereby declare that'the following'is a full, clear, and exact description thereof, reference being-had to the accompanying drawings,'and to thecharacters of reference marked thereon, which form a part of this specification.

This invention relates to improvements in automobile headlights or spot lights. It consists in the elements and features of construction shown and described, as indicated in the claims.

In the drawings Figure 1 is a. partial vertical section and partial elevation of the lamp.

Fig. 2 is a partialhorizontal section and partial elevation of the lamp..

Fig. 3 is a rear elevation of a portion of Fig. 4 is a detail section at the line 4-4 of Fig. 3. z

Fig. 5 is a detail section at the line 5-5 of Fig. 1.

' the casing, with its Fig. 6 is a perspective View of a spring.

pawl for locking the adjustable lampfocusing stop.

As shown 1n thedrawin'gs, 10 designates the lamp body or casing which comprises a relatively narrow or shallow sheet metal ring like shell which is open at its rear end and is provided at its front end with 'an in-- 'tegral or solid lens supporting flange 11. 12' 1 designates a lens which closes the front of marginal portion fitted against andin rear of-said flange. and dust proof joint is provided between the lens and casing by means of a'grooved lazing ring 14, which encircles the lensan fits closely against the inner 'wall of the casing in rear of said flange ll. 15 designates the reflector, the forward open side of which is provided with a radial, annular flange 16 Specification of Letters Patent.

of the type commonly employed forfA water LAMP.

Patented- June 3, 1919. I Application filed January 15, 1917'. Serial No. 142,402. I

that bears against the rear side of the glaz- I ing. ringl and is provided with a back rotation in the casing by means of a short lockinglug 18 extending inwardly from the casing wall and entering a notch' 19 formed in the flange 'of the reflector.

The said glaz ng ring 14 is made of asuitable soft material, such deform under pressure and'is furthermore madeslightly oversize, or of greater external diameter than the internal diameter ofthe casing, so' that when the lens and ring are as lead, which will pressed into place within. the casing said ring shapes itself to said wall to produce a closeor water and dust proof joint between said parts. Moreover thereflector flange 16 v is pressed against the rear face of said glazing ring so providing between the reflector and glazing ring a water and dust proof joint. Preferably the surfaces of said glazing ring which engage; the casingiand reflector are grooved -or corrugated so as to insure effective deformation under pressure and, therefore, reliable .moisture and dust proof joints between the engaging parts.

The'rear end of the lamp casing is closed by a removable backiplate or .Wall 20, which is provided with an annular flange 21 that fits theopen rearv end of theshell in' telescopic relation and is detachably. locked thereto, as by a bayonet joint 22' Said back plate is formed with a central opening surrounded by a rearwardly directed integral annular projection 24, which constitutes a mounting for a reduclng mirror 25-that faces in a direction opposite tothe lens 12. The said projection 24 is provided with an annular mirror supporting flange 262' Said mirror .is held or pressed against its supporting flange by means of a backing plate 27 which is provided with a marginal annular fits closely within the hollow flange 28 that projection 24 anda U-shaped spring 30, the central part of whichis attached to said backing plate and the arms 31 of which are terminally curvedat 32 to bear against the convex side of the reflector l5.

The coiiperation of the spring 30. of the mirror backing plate 27 with the reflector 15,, which latter bears against the glazing ringmounting for the reducing mirror is an.in'

tegral part of the lamp casing, being made an integral part of the back plate of the lamp casing.

At. this point a will be noted that by rea son, ofthe integral or solid lens supporting flange 11 of the lamp casing, and of theopen back of the said casing'shell -10 whichopeni, back is of a diameter at least as large as the lens glazing ring 14 and as the radial flange 16 of the reflector 15,'the assembling of the.

elements of thelamp structure may be effected throughthe back of the case when the back plate 20 is removed, and that when the lens and reflector are assembled in the casing, and when the mirror 25 and backing plate 27 areassembled in the back plate and the said plate closed upon the casing and locked thereto by the bayonet joint de scribed, or other equivalent locking joint, the spring 30 .by its action against the reflector and lens mounting, and its reaction against the backing plate and the mirror serves to reliably holdsa-id parts in'assembled position,'without the necessity of other looking or holding. means. This construetion also greatly simplifies'and facilitates the assembling operation. I

. The base of the lamp; bulb 35 is provided with the usual pins, which engage bayonet slots that are formed in a socket which is disposed at the back of and concentrically with respect to the reflector 15. Said lamp socket is made as follows:

. 4O designates an integral, rearwardly directed, concentrically disposed tubular eX- tension or flange of the sheet metal reflector. 41 designates a hollow insulating block at the rear of the reflector into the bore of which extends the flange 40. The

said bore ofthe block 41. is provided with sockets to receive lugs 43 pressed outwardly from the reflector flange, whereby the block is fixed to the reflector.

4'4 designates a lamp supporting sleeve which fits closely in the bore of said flange 40 and is longitudinally slidable therein. The said sleeve'is made of any suitable insulating material desirable. It is provided with the usual angular sockets 45 to receive at their inner ends toward the axis of the sleeve 44 and through elongated openings 48 in said sleeve. Therear end of the sleeve stop nut 50, which nut bears against the rear end face .of the block. Said nut is out of contact with the terminals 46 and 47,

. and, if desired it and the sleeve may be made ofan insulatmg material. The extension of the terminals-46, 47 through the slots'in the sleeve 44 holds the sleeve from rotation when the nut 50 is turned on the sleeve, for apurpose hereinafter to be described.

The nut 50 is locked from turning by means of a pawl .55 which engages peripheralnotches in said nut; I Said pawl may be made integral with a member 56, which is in- I tegral with a plate 52, said member, being turned backwardly on said plate 52 to give suitable resiliency tothe pawl bearing member, and'the'plate 52 is apertured to permit the pawl 55 to pass therethrough. The said member 56 is provided with openings 57 so located and dimensioned to allow the passage therethrough of screws by which-the locking plate is held in place. The peripheral notches of the nut 50'are of such size and shape as to permit the pawl to ride thereover when the nut is turned, but such as to normally hold the nut from turning.

The spring terminals 46, 47 are of such strength that they act on the lamp plug 34 and therethrough on the sleeve 44 so as to hold the sleeve and the lamp carried thereby at a limit of axial movement, determined by the nut 50 actingagainst the rear end of the block 41 and said sleeve with its supported lamp is held in a focal adjustment relatively to the reflector by the cooperative action of the spring terminals and said nut. In other Words, the spring terminals are the active factors in holding the lamp in a given focal adjustment and the nut 50, T operating through one side of its threads only, serves to retractthe sleeve 44 and the lamp carried thereby against the action of said springs. Further the nut 50 serves, passively, as a stop, and an adjustable stop by reason of its screw threaded or other adjustable relation to the sleeve 44; and the pawl 55, acting against said nut, serves to lock the parts in adjusted positions. The construction described provides means to adjust the lamp accurately in focal position relatively to the reflector so that lamp bulbs having varying lengths of filaments may be cmployed'in the lamp; and this construction provides means is screw threaded m. receive an adjusting offfocal position when a diifused light is desired.

. rectly to other circuit wire is attached at 58 to a One of 'the circuitwires is attached dithe terminal spring 46, and the swinging switch 59 which has a contact arm or lug 60, which, by the'switch passes' into and out 'of contact with the spring terminal 47; Said switch is guided in its swinging movement by means of a headed screw or pin'62, which extends through a transverse slot of the switch lever.

The switch lever extends radially. outwardly through an opening 64 ofthe mirror mounting extension of the back plate and is provided exterior to the casing with a-hand piece 65. The circuit wires pass into the casing to the terminal thus described through a bushing 66 which is fixed in any suitable manner in the ring-like shell of said casing.-

A feature of importance of the construc tion described lies in making the principal part of the lamp casing of the ring-like shell 10 provided with a front solid or integral lens supporting flange and open at its rear end. One advantage of this construction is that it simplifies the assembling of the lens and its glazing ring in the lamp casing and enables a dust and water proof joint to be made between the casing and lens without the use of separately formed attaching parts,

as screws, locking rings and the'like. Furthermore said construction renders avail.

able a maximum reflector area, the .light transmitting area of the lensbeing that due to substantially the full'diameterof the lens. A further advantage of the construction described is that 'themain-member 10 of the casing may be madesulficiently heavy to form thereon integral bosses or lugs by which to attach the lamp basing to its mounting, while the remaining portion of the casing may be made of substantially lighter material. Therefore,regardless of the size of the lamp casing it will be unnecessary to rivet or braze separately formed attaching lugs to the casing to producea strong and durable mounting.

Anotherfeature of importance of the construction described lies in the arrangement of the spring 30, or analogous yielding element, whereby its force is employed to hold the lamp elements in place without other detachable fastening means, and the reducing mirror may the lamp structure in a very simple and inexpensive manner. Furthermorathis feature of the invention greatly simplifies the construction, lessens its cost and facilitates its assembly.

It is to be understood that the invention whereby also swinging movement of back and the glazing ring.

, supporting flange,

flange, a glazing ring encircling the lens supporting be assembled inmay assume other specific embodiments Within the broader phases thereof, as set out in the appended claims, and that the invention is not shown except as to such claims where the same is specifically pointed out.

Iclaim as my invention:

- 1. A lamp comprising a shell open at its provided at its'front with a lens supporting flange, a lens fitted against said flange,a glazing ring encircling the lens and engaging the shell Wall, a reflector with-- in the casing and hearing at its front end against said glazing ring, interlocking connections between the reflector and shell to prevent rotation of the latter-on its, ,axis, a back plate detachably fitted to the shell and means acting to press the latter forwardly against 2. A lamp comprising a shell open at its back and provided at its front with a lens a lens fitted against said and engaging the shell wall, a reflector within the casing and" rovided at its front end with a 1adial flange which bearsagainst.

said. ring and with a back turned flange which engages the casing wall, a back plate detachably fitted to-the shell and means in- -terp0sed between said back plate and reflector to press the reflector forwardly against thelazing ring and to hold the lens against sai flange. V 4

- 3. A lamp comprising a shell open at its back and provided at its front with a lens flange, a lens fitted against said flange, a glazing ring encircling said lens and engaging the shell wall, a reflector bearing at its front end against said ring, a backplate detachably fitted to said shell and a U-shaped spring carried by said back limited to the embodiment j between said back plate and reflector plate with its arms bearing against the back of said i eflector.

4. A lamp comprising a casing open at its I back, a front lens, a reflector in rear of the lens, a back, plate detachably fitted to the casing and provided with an opening surrounded by'a mirror supporting flange, a mirror seated within said flange and resilient means interposed between said reflector and said mirror to hold the latter pressed against said flange.

5. A lamp comprising a shell open at its back'and provided with a front lens sup porting flange, a lens seated against said flange, a back plate detachably fitted to the shell and provided with a mirror supporting flange, a rearwardly facing mirror within said flange and yielding means acting against said mirror and said lens to hold them against their respective flanges.

6. A lamp comprising a shell open at its back, and provided -with a front lens supporting flange, a lens seated aga nst sald flange, a glazing ring encircling said lens, a

reflector in rear of the lens bearing against said ring, a back plate detachably fitted to said shell and provided with a mirror supporting flange, a rearwardly facing mirror within said flange and a spring interposed between said mirror and the reflector.

7. In a lamp, the combination with a re flector provided with a rearwardly directed tubularflange, of a hollow insulating base rearwardly facing mirror and a single re-.

\ a mirror mounting carried by said back applied over said flange and interlocked thereto to fasten the base to the reflector, and spring lamp terminals attached to said base and extending radially across the bore of said hollow base.

8. A lamp provided with a front lens, a rearwardly facing mirror, and means interposed between and acting against said lens and mirror to hold them in place.

9. A lamp provided with a front lens, a

silient member exerting pressure on the-lens and mirror to hold them in place.

10. A lamp comprising a casingv provided with a frontlens supporting flange and. open at its back, with the diameter of the back opening equal at least'to that of said flange, a back plate detacha'blyfitted to the casing,

plate and a mirror supported by said mountlng.

11; In a lamp, combination with a reflector and its tubular flange, of a hollow insulating block applied over said flange and locked thereto and provided with spring terminals, a lamp supporting sleeve within and adjustable lengthwise of said flange, and adjust flector, a lamp supporting sleeve disposed axially of the reflector, a- -lamp bulbsupported and locked in said sleeve, spring terminals bearing against the base of the lamp bulb and means acting against said spring terminals to limit the focal adjustment of the bulb in the reflector, withmeans to lock the sleeve in adjusted positions.

14. In a lamp, the combination with a reflector and a hollow insulating block secured axially thereto, of a'lamp' bulb supporting sleeve movable axiallfyf' in said block, a stop nut threaded to said sleeve and bearing against said block and spring means acting against said sleeve axially in said block. I

15. In a lamp, the combination with a re flector and a hollowv insulating block secured I axially thereto, of a lamp supporting sleeve movable axially in said block, a nut threaded to said sleeve and bearing against the block, and spring terminals for contact with the lamp bulb base and cooperating with said nut to obtain focal adjustment of the bulb in the reflector.

16. In a lamp, the combination with a re flector and a hollow insulating basesecured axially thereto, of a lamp bulb supporting 'member movable axially in said block, re-

silient means carried by said block to act against the base of a bulb seated in said 'memberto hold the bulb in adjusted positions in the reflector relatively to its focal plane, and an adjustable limiting stop 00- operatingwith said resilient means.

17. In a lamp, the combination with a reflector and a hollow insulating base secured axially thereto, of a lamp bulb supporting member movable axially in said block, fixed spring lamp terminals mounted in the block and extending radially toward the axis of the block for engagement with the terminals of the base of a lamp bulb carried by said supporting member, and an adjustable limitmg stop acting on said supporting member.

18. In a lamp, the combination with a reflector and a hollow insulating block secured axially thereto, of a lamp bulb supporting member movable axially in said block, fixed spring lamp terminals mounted on the block and extending radially toward the axis of the block for engagement with the terminals of the base of a lamp bulb carried by said supporting member, and an adjustable stop carried by said supporting member and acting against said block in opposition to the action of said spring terminals.

19. In a lamp, the combination with a reflector and a hollow. insulating block secured 110.

axially thereto, of a lamp bulb supporting member movable axially in saidblock, fixed spring lamp terminals mounted on the block and extending'radially toward the axis of .the block for engagement with the terminals of lamp base andinterlocked-to the supporting member'to'hold it from rotation, and a nut threaded to the supporting member and bearing against said block. 20. In a'lamp, the combination With a reflector and a hollow insulating block secured axially thereto, and provided with radially .disposed terminal springs to engage a lamp "Jase, of a lamp supporting sleeve movable axially in said block, a nut threaded to said sleeve and cooperating through said sleeve and a contained lamp base to vary the focal position of a lamp in the reflector, and a locking pawl to engage and lock said nut.

21. In a lamp, the combination with a reto adjust the sleeve fiector and a holloiv insulating block secured axially thereto, of a lamp supporting sleeve movable axially in said block, a nut threaded to said sleeve and bearing against said block and resilient lamp terminals secured to the block and extending radially inwardly across the bore of the block and through slots in said sleeve. I

In Witness whereof I claim the foregoing as my invention, I hereunto append my sig- 10 nature in the presence of two Witnesses at Chicago, Illinois, this 18th day of October, 1916.

v THOMAS I. DUFFY.

"Witnesses:

W. L. HALL, A. E. WALBRIDGE. 

